Asynchronous priority select logic

Details Asynchronous priority select logic Asynchronous priority select logic

1989-12-01

1991-09-24

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

370 856, 370 854, 3408255, 34082551, H04J 0302

Patent

active

050519867

ABSTRACT:
The present invention provides asynchronous priority select logic for allowinig an individual station on a token ring network to hold a token for asynchronous transmission only for a specified maximum time period. The asynchronous priority select logic comprises a token rotation timer for timing token rotations on the ring from arrival to arrival. A token holding timer limits the amount of ring bandwidth used by the station for asynchronous transmission after the token is captured by the station. Select circuitry responsive to the value of the token rotation timer determines if the captured token is still usable for transmission by determining if the token rotation timer value is less than a preselected asynchronous threshold value. The select logic includes means for generating a selected asynchronous threshold value having a first bit length. The selected asynchronous threshold value is then expanded to a second bit length corresponding to the bit length of the token holding timer value. The expanded asynchronous threshold value and the token holding timer value are then compared and an output signal is asserted if the expanded selected asynchronous threshold value is greater than the token holding timer value.

REFERENCES:
patent: 4609920 (1986-09-01), Segarra
patent: 4736368 (1988-04-01), Szczepanek
patent: 4860000 (1989-08-01), Kobayashi
William Stallings, Handbook of Computer Communications Standards, vol. 2, Howard W. Sims & Company, 1987, pp. 177-191.
Floyd E. Ross, "FDDI.sub.[An Overview", Digest of papers, computer Soc. Intl. Conf. Compion '87, pp. 434-444.
FDDI Media Acess Control (MAC-M), Working Draft Proposed American National Standard, X3T9, 5/88-139, Rev. 2, Jun. 1, 1989.
The Supernet.TM. Family for FDDI, data book, Advanced Micro Devices, pp. 4-1 through 4-51.

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